CVE-2021-25934 : Exploit Details and Defense Strategies

OpenNMS Horizon and OpenNMS Meridian versions are vulnerable to Stored Cross-Site Scripting due to a lack of input validation in the

createRequisitionedNode()

function. This flaw allows attackers to inject malicious scripts.

Understanding CVE-2021-25934

This CVE highlights a Stored Cross-Site Scripting vulnerability in OpenNMS Horizon and OpenNMS Meridian.

What is CVE-2021-25934?

CVE-2021-25934 is a vulnerability in OpenNMS Horizon and OpenNMS Meridian versions that allows attackers to inject malicious scripts due to inadequate input validation.

The Impact of CVE-2021-25934

The vulnerability enables attackers to perform Stored Cross-Site Scripting attacks, compromising the integrity and security of the affected systems.

Technical Details of CVE-2021-25934

This section details the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The flaw lies in the

createRequisitionedNode()

function not verifying inputs to the

node-label

parameter, allowing injection of arbitrary scripts.

Affected Systems and Versions

OpenNMS Horizon versions opennms-18.0.0-1 through opennms-27.1.0-1 and OpenNMS Meridian versions meridian-foundation-2015.1.0-1 through meridian-foundation-2019.1.18-1 and meridian-foundation-2020.1.0-1 through meridian-foundation-2020.1.7-1 are impacted.

Exploitation Mechanism

An attacker could exploit this vulnerability by injecting malicious scripts through the

node-label

parameter, leading to Stored Cross-Site Scripting attacks.

Mitigation and Prevention

Learn how to protect your systems from CVE-2021-25934 and reduce the risk of exploitation.

Immediate Steps to Take

Immediately apply patches, sanitize inputs, and monitor for any suspicious activities on the affected systems.

Long-Term Security Practices

Regularly update your systems, educate users on safe computing practices, and implement security best practices to prevent future vulnerabilities.

Patching and Updates

Keep track of security advisories and updates from OpenNMS to apply patches that address CVE-2021-25934.